Blimey! Hadn't noticed Timbre Adjust is now a feature of the Synchron Player and works with all its libraries.
Had suspected that VSL used some degree of synthetic timbre adjustment in the BBO mega brass library I bought, and thought it might be a useful thing for other libraries too. Well I should have known VSL was of course already way ahead with that idea. Now it's here!
I've just tried it out in SyzDimStrings, SyzDimBrass and SyzWoodwinds and it seems to work very well and convincingly everywhere - it's so very nicely and skilfully done.
One huge advantage for SyzDimStrings in particular is that voice count is greatly reduced when using Timbre Adjust, compared to Vel XF.
(Note that Vel XF must be off before Timbre Adjust can have full effect.)
Very well done and my thanks to all in VSL who brought us this lovely new feature!